From: Harry Wentland <harry.wentland@amd.com>
Date: Fri, 10 Nov 2017 11:19:02 -0500
Subject: drm/amd/display: Fix amdgpu_dm bugs found by smatch
Git-commit: 70e8ffc55b98f31af700eae525fef5d0b8fcb6e1
Patch-mainline: v4.15-rc2
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:2760
create_eml_sink() warn: variable dereferenced before check
'aconnector->base.edid_blob_ptr' (see line 2758)
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:4270
amdgpu_dm_atomic_commit_tail() warn: variable dereferenced before check
'dm_new_crtc_state->stream' (see line 4266)
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:4417
dm_restore_drm_connector_state() warn: variable dereferenced before
check 'disconnected_acrtc' (see line 4415)

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Sun peng Li <Sunpeng.Li@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |   16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2709,7 +2709,7 @@ static void create_eml_sink(struct amdgp
 			.link = aconnector->dc_link,
 			.sink_signal = SIGNAL_TYPE_VIRTUAL
 	};
-	struct edid *edid = (struct edid *) aconnector->base.edid_blob_ptr->data;
+	struct edid *edid;
 
 	if (!aconnector->base.edid_blob_ptr ||
 		!aconnector->base.edid_blob_ptr->data) {
@@ -2721,6 +2721,8 @@ static void create_eml_sink(struct amdgp
 		return;
 	}
 
+	edid = (struct edid *) aconnector->base.edid_blob_ptr->data;
+
 	aconnector->edid = edid;
 
 	aconnector->dc_em_sink = dc_link_add_remote_sink(
@@ -4198,13 +4200,13 @@ static void amdgpu_dm_atomic_commit_tail
 		update_stream_scaling_settings(&dm_new_con_state->base.crtc->mode,
 				dm_new_con_state, (struct dc_stream_state *)dm_new_crtc_state->stream);
 
+		if (!dm_new_crtc_state->stream)
+			continue;
+
 		status = dc_stream_get_status(dm_new_crtc_state->stream);
 		WARN_ON(!status);
 		WARN_ON(!status->plane_count);
 
-		if (!dm_new_crtc_state->stream)
-			continue;
-
 		/*TODO How it works with MPO ?*/
 		if (!dc_commit_planes_to_stream(
 				dm->dc,
@@ -4337,9 +4339,11 @@ void dm_restore_drm_connector_state(stru
 		return;
 
 	disconnected_acrtc = to_amdgpu_crtc(connector->encoder->crtc);
-	acrtc_state = to_dm_crtc_state(disconnected_acrtc->base.state);
+	if (!disconnected_acrtc)
+		return;
 
-	if (!disconnected_acrtc || !acrtc_state->stream)
+	acrtc_state = to_dm_crtc_state(disconnected_acrtc->base.state);
+	if (!acrtc_state->stream)
 		return;
 
 	/*